/Engine/Source/Runtime/Engine/Public/TextureRenderTargetVolumeResource.h
Copy the texels of a single depth slice of the volume into an array.
true if the read succeeded.
bool ReadPixels ( [TArray](API\Runtime\Core\Containers\TArray)< [FColor](API\Runtime\Core\Math\FColor) > & OutImageData, int32 InDepthSlice, FIntRect InRect )